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1, 0, 1, 3, 11, 37, 124, 416, 1409, 4828, 16741, 58697, 207868, 742667, 2674063, 9694235, 35356683, 129643193, 477636116, 1767259009, 6564113655, 24466256074, 91482545929, 343059584993, 1289904100956, 4861946326427, 18367352950759, 69533550719586
(列表;图表;参考;听;历史;文本;内部格式)
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